P1748 Fault Code in Ford: Causes, Symptoms, and Fixes

This generally indicates an issue with the transmission pressure control solenoid (PCS) circuit or its operation. The solenoid controls hydraulic pressure inside the transmission for smooth gear shifting.

Possible Causes:

1. Faulty pressure control solenoid
2. Wiring harness issues (short/open circuit, corroded connectors)
3. Low or dirty transmission fluid
4. Internal transmission hydraulic problem (valve body issue)
5. Faulty TCM (Transmission Control Module)

Symptoms:

1. Harsh or delayed shifting
2. Transmission slipping
3. Vehicle stuck in limp mode
4. Check Engine Light / Transmission warning light ON

Diagnosis Steps:

1. Check ATF level & condition – Low, burnt, or dirty oil can cause solenoid issues.
2. Inspect wiring & connectors – Look for damage, corrosion, or loose connections to the solenoid.
3. Scan live data – Verify solenoid operation and pressure readings.
4. Test solenoid resistance – Compare with manufacturer specs.
5. Check TCM – If wiring & solenoid are fine, module may be faulty.

Repair Options:

1. Top up / replace transmission fluid & filter
2. Repair or replace damaged wiring
3. Replace pressure control solenoid / valve body
4. Reprogram or replace TCM if needed